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2. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

3. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.

4. Computer monitor - Wikipedia

   en.wikipedia.org/wiki/Computer_monitor

   A fixed rack mount monitor is mounted directly to the rack with the flat-panel or CRT visible at all times. The height of the unit is measured in rack units (RU) and 8U or 9U are most common to fit 17-inch or 19-inch screens. The front sides of the unit are provided with flanges to mount to the rack, providing appropriately spaced holes or ...

5. Rack and pinion - Wikipedia

   en.wikipedia.org/wiki/Rack_and_pinion

   The rack and pinion mechanism is used in rack railways, where the pinion mounted on a locomotive or a railroad car engages a rack usually placed between the rails, and helps to move the train up a steep gradient. It is also used in arbor presses and drill presses, where the pinion is connected to a lever and displaces a vertical rack (the ram).

6. M8 armored gun system - Wikipedia

   en.wikipedia.org/wiki/M8_Armored_Gun_System

   An M8 AGS climbs a vertical wall at a test track. Level II and III armor packages can be airdropped separately from the AGS and installed in the field in under three hours. [ 76 ] All versions are air-transportable by C-130, C-141, C-17 and C-5 (one, two, three and five systems respectively). [ 154 ]